First: According to the Wikipedia page on the serial comma, the GPO Style Manual supports its mandatory use. Given FGI’s subject matter, your preference seems appropriate.

Second: The question of whether or not the blog title uses the serial comma depends on where in the page you look. The prominent, white words in the brown box make it look as though the serial comma has been omitted. However, the page is coded to include the serial comma in the Title tag — just look in your window’s title bar for confirmation. In fact, if you search the HTML, there isn’t a single place where “myths and” appears without a comma after “myths”. You appear to have correctly quoted the blog’s content rather than its title’s graphical representation. Well done.